How do I block on PC

Hello guys,
First of all big thanks to developers for such an elaborate game in medieval setting, been playing it for 10 hours on pc and enjoying it greatly and so far the only issue for me was an occasional nude person and some lighting flicker inside interiors.

What I can’t figure out however, is how to block. I’m playing on PC so if someone can tell me which button to press I will really be thankful!!

If you look at controls its Q bud…

Thanks a lot!